Java对文件的16进制读取和操作

from:http://blog.csdn.net/cdtdx/archive/2007/03/15/1529804.aspx

大家可以参考一下源代码的相关部分注释，然后写出自己的16进制处理程序。
有几个重点地方：

16进制字符串-》10进制数

int input = Integer.parseInt("Str", 16)

10进制整数-》16进制字符串

String hex = Integer.toHexString(int)

文件读取方法

作为2进制文件直接读取，一个byte为单位的读取。

将来我还将在此基础上制作Java版本的16进制编辑器，请大家多多支持。谢谢。

/**
* RO Utility
* Mainly used for:
* 1.Double Open client
* 2.Open Unlimited View
* 这是个样本程序，是我针对游戏修改写的。主要作用是将游戏文件用16进制打开，然后
* 修改相关的部分，然后保存。
*
* @author Ciro Deng(cdtdx@sohu.com)
* @version 1.0
*/
package cn.edu.uestc.rotool;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringWriter;

/**
* RO Utility Mainly used for: 1.Double Open client 2.Open Unlimited View
*
* @author Ciro Deng(cdtdx@sohu.com)
* @version 1.0
*
*/
public class MainTool {

private final String RO_HOME = "D://Games//RO//"; //修改文件的路径

private final String FILE = "Ragexe"; //修改文件的主文件名

private final String BAK_FILE = FILE + "_BAK.sp2"; //修改文件的备份扩展名

private final String PATCH_FILE = FILE + ".sp2"; //修改文件的扩展名

/**
* 进行16进制替换的规则定义
* Pattern Array Example: pattern[0][0] = "Original Hex String"; 原16进制字符串
* pattern[0][1] = "New Hex String"; 要替换的16进制字符串
*/
private final String[][] pattern = {
{ "85C074095F5E33C05B8BE55DC3", "85C0EB095F5E33C05B8BE55DC3" },
{ "85C0740E5F5EB801000000", "85C0EB0E5F5EB801000000" }, // Double
// Open
{ "000066430000C843", "0000004300008644" } // Umlimited View

};

/**
* 备份文件恢复
* ture the backup file into real file
*
*/
public void restore() {
if (isExistBackup()) {
new File(RO_HOME + PATCH_FILE).delete();
new File(RO_HOME + BAK_FILE)
.renameTo(new File(RO_HOME + PATCH_FILE));
System.out.println("[----------------Restore file OK!--------------------]");
} else {
System.out.println("Backup file does not exist!");
System.exit(0);

}
}

public void init() { //初始化操作
if (new File(RO_HOME + PATCH_FILE).exists()) {
System.out
.println("[-------------Initialize original file OK!-----------]");
} else {
System.out.println("File is not Existed! Please restore it first!");
}

// backup original file
if (!isExistBackup()) {
new File(RO_HOME + PATCH_FILE)
.renameTo(new File(RO_HOME + BAK_FILE));
}

System.out
.println("[---------------Please choose your action------------]");
System.out.println("1:Modify double open and unlimited view mode!");
System.out.println("2:Restore original mode!");
System.out.println("Please input 1 or 2 and Enter:");

}

public void success() { //成功操作提示
System.out.println();
System.out
.println("[-------------Patch file OK! Have fun with RO!-------]");
}

/**
* 进行16进制替换
* replace input Hex String with defined pattern
*
* @param original
* @return
*/
public String replace(String original) {
for (int i = 0; i < pattern.length; i++) {
original = original.replaceAll(pattern[i][0].toLowerCase(),
pattern[i][1].toLowerCase());
}

return original;

}

/**
* 将文件读取为16进制String
* Read original File and transfer it into Hex String
*
* @return
* @throws IOException
*/
public String readOriginal2Hex() throws IOException {
FileInputStream fin = new FileInputStream(new File(RO_HOME + BAK_FILE));
StringWriter sw = new StringWriter();

int len = 1;
byte[] temp = new byte[len];

/*16进制转化模块*/
for (; (fin.read(temp, 0, len)) != -1;) {
if (temp[0] > 0xf && temp[0] <= 0xff) {
sw.write(Integer.toHexString(temp[0]));
} else if (temp[0] >= 0x0 && temp[0] <= 0xf) {//对于只有1位的16进制数前边补“0”
sw.write("0" + Integer.toHexString(temp[0]));
} else { //对于int<0的位转化为16进制的特殊处理，因为Java没有Unsigned int，所以这个int可能为负数
sw.write(Integer.toHexString(temp[0]).substring(6));
}
}

return sw.toString();
}

/**
* 将替换后的16进制字符串写回文件
* write replaced original String to file
*
* @param replaced
* @throws NumberFormatException
* @throws IOException
*/
public void writeNew2Binary(String replaced) throws NumberFormatException,
IOException {
FileOutputStream fout = new FileOutputStream(RO_HOME + PATCH_FILE);

for (int i = 0; i < replaced.length(); i = i + 2) {
fout.write(Integer.parseInt(replaced.substring(i, i + 2), 16));
}

}

/**
* test direct output string to file
*
* @param temp
* @throws IOException
*/
public void writeTest(String temp) throws IOException {
FileOutputStream fout = new FileOutputStream(RO_HOME + "test.txt");
for (int i = 0; i < temp.length(); i++) {
fout.write(temp.charAt(i));
}
}

/**
* check if the backup file exists
*
* @return
*/
public boolean isExistBackup() {
return new File(RO_HOME + BAK_FILE).exists();
}

/**
* 主要操作方法，组织工作流程
* Main process method
*
* @throws IOException
*/
public void patch() throws IOException {
// init
init();
//输入参数：
//1:进行查找替换
//2:将备份文件恢复
String input = new BufferedReader(new InputStreamReader(System.in))
.readLine();
if (input.equals("1")) {
String temp = null;
temp = readOriginal2Hex();
temp = replace(temp);
writeNew2Binary(temp);
success();
} else if (input.equals("2")) {
restore();
} else {
System.out.println("Bad input parameter!");
System.exit(0);
}

}

/**
* Main方法
* main
*
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
MainTool tool = new MainTool();
tool.patch();

}

}